MESON Chess Problem Database

Problem Display
PID: 200287 (1Q2K1B1/6br/pnPN3p/1PkP2p1/q1P1p3/P2p1n2/2N4B/1RR4b w - - 0 1)

Eerkes, Allard Pieter

Probleemblad, 1980

1Q2K1B1/6br/pnPN3p/1PkP2p1/q1P1p3/P2p1n2/2N4B/1RR4b

#2

13 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qb4
      • 2.axb4#
    • 1...Qxc4
      • 2.Sb7#
    • 1...Sxc4
      • 2.Sxe4#
  • Keys
    • 1.Sd4!
      • threat
        • 2.Se6#
      • 1...Kxd4
        • 2.Qxb6#
      • 1...Qxc4
        • 2.Sb3#
      • 1...Bxd4
        • 2.Sxe4#
      • 1...Sxd4
        • 2.Sb7#
      • 1...Sxc4
        • 2.Qa7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(d);OGATE::P(E),XQ(d)
    • Q(d);SBLOCK,XP(F)::S(J)
    • S(i);SBLOCK,XP(F)::S(J),XP(e)
  • Actual
    • S(C);
    • Threat
      • S(C)
    • Vars
      • K(f);S_FLIGHT,XS(C)::QAB(K),XS(i)
      • Q(d);N_GUARD,P_SPINQ(d),XP(F)::S(C)
      • B(k);SBLOCK,XS(C)::S(J),XP(e)
      • S(c);SBLOCK,XS(C)::S(J)
      • S(i);OGATEB,P_SPINS(i),XP(F)::QAB(K)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).